Traffic Engineering Research Centre Department of Civil and Environmental Engineering, NTNU
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1 Managed motorways Seminar Traffic Management and Control June 8 th 2017, Thon Hotel Bristol, Oslo Arvid Aakre Traffic Engineering Research Centre Department of Civil and Environmental Engineering, NTNU arvid.aakre@ntnu.no Content Introduction Terminology; Managed motorway, Capacity and Productivity Brief summary of the Motorway Capacity Guide Measurement results Recommended values for design Future work Some comments on Norwegian and Nordic conditions 1
2 Introduction - background Motorway Capacity Guide Part 1: Metropolitan Managed Motorways (Draft May 2017) Authors: John Gaffney and Hendrik Zurlinden, VicRoads, Melbourne, Australia Introduction Melbourne motorway network Melbourne is the capital of Victoria southeast in Australia Area ~ km 2 (~ Oslo + Akershus + Østfold) Population ~ 4.6 mill (~ Slightly less than Norway) Motorway network covers 7% of the urban arterial road lane kms 40% of the urban arterial road travel (increasing) M1 corridor from west to east of the map is about 70 km 2
3 Introduction - M1 Corridor 70 km motorway corridor Total entering volume ~ vehicles a day More than 1 million trips each day (1.2 persons per vehicle) Speed limits and enforcement Australian urban motorways have a maximum speed limit of 100 km/h A very active and strict enforcement regime In Victoria the tolerance is only +3 km/t -> relative small speed differences 3
4 Managed motorways A managed motorway is a motorway which uses different traffic management measures to enhance quality of traffic flow Examples of such measures are variable speed limits, ramp metering, hard shoulder running, traffic information, alternative routes, ITS measures, lane signals, traffic data collection and monitoring, incident detection etc John Gaffney: «A congested motorway is a poorly managed motorway» Capacity «The maximum sustainable flow rate at which vehicles or perons can be expected to traverse a point or uniform segment of a lane or roadway during a specified time period under given roadway, geometric, traffic, environmental and control conditions» (HCM 2016) Capacity values are measured at active bottlenecks and determined on the basis of systematical analysis of data to capture the effect of systematic and random fluctuations under a wide range of demand patterns 4
5 Capacity Capacity should be based on long-term measurements Should not use short term traffic counts on a single day Each dot above is a one hour measurement Factors impacting on capacity Cross section Lane and shoulder width Visibility Alignment Gradient Curvature Sags and crests Traffic Vehicle type distribution Location Share of commuters Other Merge, diverge, weaving Auxiliary lanes Acceleration, deceleration lanes Traffic management Ramp metering Maintenance Work zones Enforcement regime Driver behaviour Headways Braking Lane changing activity Compliance with road rules 5
6 Productivity Productivity is defined as the product of traffic speed and traffic flow Unit is vehicle-kilometers travelled on a road segment per time unit High productivity is achieved when both traffic flow and traffic speed are maintained near maximum values Efficient energy use align closely with the point where the motorway operates at maximum productivity Productivity is a good measure for efficiency, safety as well as environmental conditions Measurements Please remember, a flow rate of 1800 veh/hour means: an average time headway (front-front) of 2 seconds An average time gap (front-back) of about 1.8 sec (depending on speed and vehicle length) 6
7 Measurements No interaction between sections; elimination of downstream bottlenecks (above) Interaction between sections, no elimination of downstream bottlenecks (below) Recommended values for design Design values are typical about 90% of observed capacity See also more complex theoretical methods and models 7
8 Managed motorway probability for breakdown Managed motorway probability for breakdown 8
9 Design of unmanaged and managed motorways Design of unmanaged motorways (above) Design of managed motorways (below) Future work and investigations Merging, diverging and weaving Differences between unmanaged and managed motorways Capacity loss and recovery Congestion and safety Lane changing activity and capacity Effect of geometric parameters and heavy vehicles 9
10 What about Norwegian / Nordic conditions? Swedish guidelines are reviewed in the Australian Motorway Capacity Guide together with the US (HCM), UK, German and Dutch guidelines We have limited experiences with Norwegian conditions, but the values from Australia seems to be useful also in Norway Norwegian motorways have a very limited degree of management There is a large potential for improvement Thank you for your attention Arvid Aakre NTNU Traffic Engineering Research Centre Norwegian University of Science and Technology Trondheim, NORWAY arvid.aakre@ntnu.no 10
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